Compilare: user.cpp: In function ‘void dvd(int, int, int&)’: user.cpp:18:33: warning: operation on ‘v[pm]’ may be undefined [-Wsequence-point] v[m]=v[m]^v[pm]^(v[pm]=v[m]); ^ user.cpp:24:40: warning: operation on ‘v[is]’ may be undefined [-Wsequence-point] v[id]=v[id]^v[is]^(v[is]=v[id]); ^ user.cpp: In function ‘int main()’: user.cpp:51:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&k); ^ user.cpp:53:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d", &v[i]); ^